Xu, Yitian
Zhang, Yuqun
Zhao, Jiang
Yang, Zhiji
Pan, Xianli
Funding for this research was provided by:
National Natural Science Foundation of China (11671010)
Beijing Natural Science Foundation (4172035)
Article History
Received: 21 February 2016
Accepted: 24 August 2017
First Online: 29 August 2017